[Misc] Clean up and comment checkstyle-suppressions

xwiki-platform-core/xwiki-platform-index/xwiki-platform-index-default/src/checkstyle/checkstyle-suppressions.xml

@@ -25,5 +25,6 @@
     "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
 
 <suppressions>
+  <!-- FanOut complexity of 22 on a max of 20 -->
   <suppress checks="ClassFanOutComplexity" files="src/main/java/org/xwiki/index/internal/DefaultTasksManager\.java"/>
 </suppressions>

xwiki-platform-core/xwiki-platform-oldcore/src/checkstyle/checkstyle-suppressions.xml

@@ -25,7 +25,6 @@
     "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
 
 <suppressions>
-  <suppress checks="FanOutComplexity" files="HqlQueryExecutor.java"/>
+  <!-- FanOut complexity of 28 on a max of 20 -->
   <suppress checks="FanOutComplexity" files="FOPXSLFORenderer.java"/>
-  <suppress checks="FanOutComplexity" files="WrappingXWikiRequest.java"/>
 </suppressions>